Devices for braking and propelling the shuttle in mechanical looms



Feb. 28, 1956 P. c. SELLES 2,736,340

DEVICES FOR BRAKING AND PROPELLING THE SHUTTLE IN MECHANICAL LOOMS FiledJan. 9, 1953 2 Sheets-Sheet 1 INVENTOR. F: OR!) ERDANS SELL-ES Feb. 28,1956 P. c. SELLES DEVICES FOR BRAKING AND PROPELLING THE SHUTTLE INMECHANICAL LOOMS 2 Sheets-Sheet Filed Jan. 9, 1953 INVENTOR. VEDRCERDAP/S ELLES United States Patent 9 DEVICES FOR BRAKING AND PROPELLINGTHE SHUTTLE IN MECHANICAL LOOMS Pedro Cerdans Sells, Barcelona, SpainApplication January 9, 1953, Serial No. 330,388

Claimspriority, application Spain January 11, 1952 4 Claims. (Cl.139-185) This invention relates to improvements in the devices forbraking and propelling the shuttle in mechanical looms.

It is an object of the invention to provide braking by pneumatic meansin conjunction with means for applying a progressive frictional brakingforce, the picker of the shuttle being free from the sword and mountedon a guided carriage of definite and fixed positions, the wholeconcerning very important facts in connection with the working of theshuttle, the yield of the loom and a guarantee of certainty in stopping.

It is a further object of the invention to provide the fitting of areceiver or movable stop-butt into the shuttlebox, which, being suitablyguided, acts on two cylinders of pneumatic braking, whilst the saidstop-butt comes against a belt or sloping piece of leather, producingprogressive friction; the picker being, on the other hand, independentof the sword and mounted on the carriage that, in its course, reachesfour different fixed positions, one being its extreme rear position, onewhich it reaches on its return so that the picker may come into contactwith the point of the shuttle, another at the point of expulsion and theother at the full braking point and, finally, at the beginning of itscycle again when the shuttle returns. The improvements in this inventionfurther offer the necessary certainty of automatic stoppage should theshuttle not arrive at the correct moment.

With the foregoing and other objects in view, the present inventionconsists in certain improvements in the devices for braking andpropelling the shuttle in mechanical looms, which comprises anadjustable pneumatic brake in co-operation with a progressive frictionbelt against which there press some retaining levers and on which thelever assuring the entrance of the shuttle acts, the latter remaining ina fixed position for the return run, in which position the change ofspool is made and the picker stays in contact with the point of theshuttle to check the expulsion of the latter with a minimum of shock.

In order that the invention may be more readily understood, reference ismade to the accompanying drawings,

which illustrate diagrammatically and by way of example one embodimentthereof, and in which:

Fig. 1 is an elevation of the braking device;

Fig. 2 is a plan View of the upper side of the same device;

Fig. 3 is a detail of the safety lever;

Fig. 4 is a detail of the retention lever; and 1 Fig. 5 is a scheme ofthe cycle through which th picker and sword run.

The arrangement in this invention contains the movable stop-butt 1 setinto the framework of the loom and mounted on the sliding carriage 2,which is integral with the two cylinders 3 which also slide in saiddirection on either side of the shuttle-box and on the fixed pistons 4,bringing about between the former and the latter a pneumatic brakingaction by means of the enclosed air acting on the cylinder walls. Thesaid fixed pistons 4 are pierced along their length by the conduit 5that communicates through 6 with a source of air-pressure in order tobring 2,736,340 Fatented Feb. 28, 1956 c ICC the cylinders 3 andcarriage 2 back into position. The two piston pieces 4, although theirposition is fixed, may have their position adjusted by means of thescrew 7 which, acting on the arm 8 of the piece that joins the twopistons so as to enable the chamber or space between the two pistons andthe cylinders 3 to be enlarged or diminished.

The elongated friction member 10 co-operates in the braking of theshuttle 9 by engaging carriage 2, it being tightly stretched from thefixed end 11, where it is fastened by the screws 12, to the end portion13 of the oscillating lever 14. This lever- 14 oscillates about thepivot 15, its

position may be regulated by means of the screw 16, and it is held inposition by the spring 17.

Against this belt or friction member 10 act the levers or rods 18 whichare operatively connected to the batten to hold the belt firmly in placewhen the batten begins to come forward, this increasing the force of thebrake as long as the movement of the batten lasts, the pressure ceasingwhen the batten stops.

The lever 19 assures the entrance of the shuttle by bringing thestopping device into play when that part does not begin to move away atthe right moment. It also brings into action a safety device that willstop the forward movement of the batten when the above-mentioned casearises. The spring 20 constantly presses on the lever 19 to maintain andassure its proper operation.

The picker 21 is independent of the sword 22 and is set on the slidingcarriage 23 on the guides 24, the said carriage being operated by theend 25 of the sword 22.

The movements of the carriage within the shuttle-box in connection withthose of the sword are shown schematically in Fig. 5, in which thetrajectory ab represents the path of the carriage 23 with an overrun; bcrepresents the run covered to obtain the exact position of the shuttlein which the picker must come into contact with it, if a change of spoolor pulsation of woof is to be carried out; cd represents the expulsionof the shuttle; and de represents the braking.

I claim:

1. In a mechanical loom including a shuttle, a shuttle braking device,comprising in combination, a stop adapted to engage the shuttle; acarriage supporting said stop; a pair of parallel cylindrical membersclosed at one end and adapted to extend in the direction of shuttlemovement;

a pair of elongated piston members having a pair of ends projecting intosaid cylindrical members so that movement of said stop by the shuttle inone direction reduces the air spaces defined in said cylindrical membersby said piston members, said piston members being formed with conduitsopening at said pair of ends of said piston members into said air spacesand adapted to communicate with a source of pressurized air for movingsaid cylindrical members in an opposite direction; an elongated frictionbelt member extending in said one direction for engaging said carriageso as to brake movement of the same in said one direction; and anadjustable member having one end engaging said elongated friction memberand being movable between a plurality of advanced positions for urgingsaid friction member at variable pressure against said carriage.

2. A braking device as claimed in claim 1 and including at least onelever movable between an inoperative and an advanced operative positionengaging said friction member and urging the same to engage saidcarriage for braking the shuttle, said lever being adapted to beoperated by the batten of the loom to move between said inoperativeposition and said operative position in accordance with the battenmovement.

3. A device as claimed in claim 2 and including a shuttle picker; guidemeans supporting said shuttle picker for reciprocal movement; a movablesword having a head 1x2 portion connected to said shuttle picker formoving the same, said shuttle picker being movable between fourpositions, namely, an end position into which said shuttle picker isadapted to be urged by the shuttle, a second. Position adapted to, holdthe shuttle in a spool changing position, a third position for throwingthe shuttle, accelerated during movement from said second to said, thirdposition.

and a braking position for engaging the returned shuttle.

4. A device as claimed in claim 1 and including a shuttle picker; guidemeans supporting said shuttle picker for reciprocal movement; a movablesword having a head portion connected. tov said shuttle. picker formoving; the same, said shuttle picker eing movable between tourpositions, narvnel y, an end position into whichsaid, shnttlg picker isadapted to be urged by the shuttle, a second 4 205M9 1 a pte hold h s lin a .190 1 hangin position, a third position for throwing the shuttleaccelerated during movement. from said second to said third position,and a braking position for engaging the returned shuttle.

References Cited in the file of this patent UNITED STATES PATENTS 8 Baclman Y V V M y 1909 1,315,608 Newton-Smith Sept. 9, 1919 2,105,578 BahanIan. 18, 1938 2,426,271 Kottemann Sept. 2, 1947 2,538,530 Kronofi Jan.16', 1951

